I am running into the same issue. I created a noreply@mydomain.com email account on Plesk, which refuses to send emails to my G Suite managed email account myname@mydomain.com and reports the same “Recipient address rejected: User unknown in virtual mailbox table” error because it is trying to deliver emails locally.
We need a fix to allow us to send all emails externally from a Plesk email account.
I am running into the same issue. I created a noreply@mydomain.com email account on Plesk, which refuses to send emails to my G Suite managed email account myname@mydomain.com and reports the same “Recipient address rejected: User unknown in virtual mailbox table” error because it is trying to deliver emails locally.
We need a fix to allow us to send all emails externally from a Plesk email account.